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Global-scale tidal variability during the PSMOS campaign of June-August 1999: interaction with planetary waves

Pancheva, D.; Merzlyakov, E.; Mitchell, N.J.; Portnyagin, Yu.; Manson, A.H.; Jacobi, Ch.; Meek, C.E.; Luo, Y.; Clark, R.R.; Hocking, W.K.; MacDougall, J.; Muller, H.G.; Kürschner, D.; Jones, G.O.L.; Vincent, R.A.; Reid, I.M.; Singer, W.; Igarashi, K.; Fraser, G.I.; Fahrutdinova, A.N.; Stepanov, A.M.; Poole, L.M.G.; Malinga, S.B.; Kashcheyev, B.L.; Oleynikov, A.N.. 2002 Global-scale tidal variability during the PSMOS campaign of June-August 1999: interaction with planetary waves. Journal of Atmospheric and Solar-Terrestrial Physics, 64 (17). 1865-1896. 10.1016/S1364-6826(02)00199-2

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Abstract/Summary

During the PSMOS Global-scale tidal variability experiment campaign of June 1-August 31, 1999, a network of radars made measurements of winds, waves and tides in the mesosphere/lower-thermosphere region over a wide range of latitudes. Clear evidence was found that fluctuations in tidal amplitudes occur on a global scale in both hemispheres, and that at least some of these fluctuations are periodic in nature. Modulation of the amplitude of the 12 h tide was particularly evident at periods of 10 and 16 days, suggesting a non-linear interaction with planetary waves of those periods to be responsible. In selected cases, the secondary waves predicted from non-linear theory could be identified and their zonal wave numbers determined. In some, but not all, cases the longitudinal structure of the secondary waves supports the theory of planetary-wave/tidal interaction being responsible for the observed tidal modulation. It was noted also that beating between a 12.4-lunar and the solar tide could produce a near 16-day modulation of the 12 h tide amplitude that is frequently observed in late summer.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/S1364-6826(02)00199-2
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Geospace Atmosphere Transfer Functions
ISSN: 1364-6826
Additional Keywords: MLT region dynamics, tidal variability, non-linear interactions, lunar tide
NORA Subject Terms: Physics
Atmospheric Sciences
Date made live: 14 Mar 2012 09:27
URI: http://nora.nerc.ac.uk/id/eprint/13641

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